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Research article - Peer-reviewed, 2023

Within-site adaptation: growth and mortality of Norway spruce, Scots pine and silver birch seedlings in different planting positions across a soil moisture gradient

Nordin, Per; Olofsson, Erika; Hjelm, Karin

Abstract

Adapting to site conditions is a central part of forest regeneration and can be done through selec-tion of different planting positions. Requirements are tree species specific, and the use of soil moisture maps could be a way to support decision making in forest regeneration planning. At two experimental sites with varying soil moisture conditions in southern Sweden Norway spruce (Picea abies (L.) Karst.), Scots pine (Pinus sylvestris L.), and silver birch (Betula pendula Roth) seedlings were planted in four different planting positions following mounding site preparation; Depression, Hinge, Mound and Unscarified. Soil moisture estimates were obtained from a high-resolution depth-to-water raster for each planting spot. The effect of soil moisture, planting position and their interactions on mortality, height and diameter was evaluated for each tree species. In wet conditions mounds proved to be the best option to minimize seedling mortality for conifers, but with decreasing soil moisture, differences between the planting positions decreased. Birch on the other hand had the greatest survival in the hinge. The coniferous species displayed increased height and diameter when planted in mounds independent of the soil moisture conditions, whereas silver birch was less dependent on a specific planting position. Results from this study shows that a soil moisture map can explain mortality, height and diameter and thus can be a useful tool when choosing planting position in different soil moisture conditions.

Keywords

decision making; depth-to-water; microsite; mounding; planting; regeneration

Published in

Silva Fennica
2023, Volume: 57, number: 3, article number: 23004
Publisher: FINNISH SOC FOREST SCIENCE-NATURAL RESOURCES INST FINLAND

    Associated SLU-program

    SLU Plant Protection Network

    UKÄ Subject classification

    Forest Science

    Publication identifier

    DOI: https://doi.org/10.14214/sf.23004

    Permanent link to this page (URI)

    https://res.slu.se/id/publ/127898